Use different, specific types for helper variables

Also add some comments.

Author: strager

tests/baselines/reference/typeAliasDeclareKeywordNewlines.errors.txt

@@ -2,14 +2,14 @@ typeAliasDeclareKeywordNewlines.ts(5,1): error TS1142: Line break not permitted
 
 
 ==== typeAliasDeclareKeywordNewlines.ts (1 errors) ====
-    var declare: any, type: any;
+    var declare: string, type: number;
 
     // The following is invalid but should declare a type alias named 'T1':
     declare type /*unexpected newline*/
     T1 = null;
     ~~
 !!! error TS1142: Line break not permitted here.
-    const t1: T1 = null;
+    const t1: T1 = null; // Assert that T1 is the null type.
 
     let T: null;
     // The following should use a variable named 'declare', use a variable named
@@ -22,5 +22,5 @@ typeAliasDeclareKeywordNewlines.ts(5,1): error TS1142: Line break not permitted
     // named 'T2':
     declare /*ASI*/
     type T2 = null;
-    const t2: T2 = null;
+    const t2: T2 = null; // Assert that T2 is the null type.
 

tests/baselines/reference/typeAliasDeclareKeywordNewlines.js

@@ -1,12 +1,12 @@
 //// [tests/cases/compiler/typeAliasDeclareKeywordNewlines.ts] ////
 
 //// [typeAliasDeclareKeywordNewlines.ts]
-var declare: any, type: any;
+var declare: string, type: number;
 
 // The following is invalid but should declare a type alias named 'T1':
 declare type /*unexpected newline*/
 T1 = null;
-const t1: T1 = null;
+const t1: T1 = null; // Assert that T1 is the null type.
 
 let T: null;
 // The following should use a variable named 'declare', use a variable named
@@ -19,12 +19,12 @@ T = null;
 // named 'T2':
 declare /*ASI*/
 type T2 = null;
-const t2: T2 = null;
+const t2: T2 = null; // Assert that T2 is the null type.
 
 
 //// [typeAliasDeclareKeywordNewlines.js]
 var declare, type;
-var t1 = null;
+var t1 = null; // Assert that T1 is the null type.
 var T;
 // The following should use a variable named 'declare', use a variable named
 // 'type', and assign to a variable named 'T'.
@@ -34,4 +34,4 @@ T = null;
 // The following should use a variable named 'declare' and declare a type alias
 // named 'T2':
 declare; /*ASI*/
-var t2 = null;
+var t2 = null; // Assert that T2 is the null type.

tests/baselines/reference/typeAliasDeclareKeywordNewlines.symbols

@@ -1,18 +1,18 @@
 //// [tests/cases/compiler/typeAliasDeclareKeywordNewlines.ts] ////
 
 === typeAliasDeclareKeywordNewlines.ts ===
-var declare: any, type: any;
+var declare: string, type: number;
 >declare : Symbol(declare, Decl(typeAliasDeclareKeywordNewlines.ts, 0, 3))
->type : Symbol(type, Decl(typeAliasDeclareKeywordNewlines.ts, 0, 17))
+>type : Symbol(type, Decl(typeAliasDeclareKeywordNewlines.ts, 0, 20))
 
 // The following is invalid but should declare a type alias named 'T1':
 declare type /*unexpected newline*/
 T1 = null;
->T1 : Symbol(T1, Decl(typeAliasDeclareKeywordNewlines.ts, 0, 28))
+>T1 : Symbol(T1, Decl(typeAliasDeclareKeywordNewlines.ts, 0, 34))
 
-const t1: T1 = null;
+const t1: T1 = null; // Assert that T1 is the null type.
 >t1 : Symbol(t1, Decl(typeAliasDeclareKeywordNewlines.ts, 5, 5))
->T1 : Symbol(T1, Decl(typeAliasDeclareKeywordNewlines.ts, 0, 28))
+>T1 : Symbol(T1, Decl(typeAliasDeclareKeywordNewlines.ts, 0, 34))
 
 let T: null;
 >T : Symbol(T, Decl(typeAliasDeclareKeywordNewlines.ts, 7, 3))
@@ -23,7 +23,7 @@ declare /*ASI*/
 >declare : Symbol(declare, Decl(typeAliasDeclareKeywordNewlines.ts, 0, 3))
 
 type /*ASI*/
->type : Symbol(type, Decl(typeAliasDeclareKeywordNewlines.ts, 0, 17))
+>type : Symbol(type, Decl(typeAliasDeclareKeywordNewlines.ts, 0, 20))
 
 T = null;
 >T : Symbol(T, Decl(typeAliasDeclareKeywordNewlines.ts, 7, 3))
@@ -36,7 +36,7 @@ declare /*ASI*/
 type T2 = null;
 >T2 : Symbol(T2, Decl(typeAliasDeclareKeywordNewlines.ts, 16, 7))
 
-const t2: T2 = null;
+const t2: T2 = null; // Assert that T2 is the null type.
 >t2 : Symbol(t2, Decl(typeAliasDeclareKeywordNewlines.ts, 18, 5))
 >T2 : Symbol(T2, Decl(typeAliasDeclareKeywordNewlines.ts, 16, 7))
 

tests/baselines/reference/typeAliasDeclareKeywordNewlines.types

@@ -1,16 +1,16 @@
 //// [tests/cases/compiler/typeAliasDeclareKeywordNewlines.ts] ////
 
 === typeAliasDeclareKeywordNewlines.ts ===
-var declare: any, type: any;
->declare : any
->type : any
+var declare: string, type: number;
+>declare : string
+>type : number
 
 // The following is invalid but should declare a type alias named 'T1':
 declare type /*unexpected newline*/
 T1 = null;
 >T1 : null
 
-const t1: T1 = null;
+const t1: T1 = null; // Assert that T1 is the null type.
 >t1 : null
 
 let T: null;
@@ -19,10 +19,10 @@ let T: null;
 // The following should use a variable named 'declare', use a variable named
 // 'type', and assign to a variable named 'T'.
 declare /*ASI*/
->declare : any
+>declare : string
 
 type /*ASI*/
->type : any
+>type : number
 
 T = null;
 >T = null : null
@@ -31,11 +31,11 @@ T = null;
 // The following should use a variable named 'declare' and declare a type alias
 // named 'T2':
 declare /*ASI*/
->declare : any
+>declare : string
 
 type T2 = null;
 >T2 : null
 
-const t2: T2 = null;
+const t2: T2 = null; // Assert that T2 is the null type.
 >t2 : null
 

tests/cases/compiler/typeAliasDeclareKeywordNewlines.ts

@@ -1,9 +1,9 @@
-var declare: any, type: any;
+var declare: string, type: number;
 
 // The following is invalid but should declare a type alias named 'T1':
 declare type /*unexpected newline*/
 T1 = null;
-const t1: T1 = null;
+const t1: T1 = null; // Assert that T1 is the null type.
 
 let T: null;
 // The following should use a variable named 'declare', use a variable named
@@ -16,4 +16,4 @@ T = null;
 // named 'T2':
 declare /*ASI*/
 type T2 = null;
-const t2: T2 = null;
+const t2: T2 = null; // Assert that T2 is the null type.